[Bug 1995274]

[Mark J. Wielaard]

Looks like I never properly closed this. Apologies.

All Luboš have been committed and made it into valgrind 3.20.0

commit 026cda6c8111ef6ff79bd5c6e083ab50ccf3ded6
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Tue Apr 26 13:53:14 2022 +0200

    support DW_FORM_addrx3 and DW_FORM_strx3
    
    Apparently these may get used after all with large enough binaries,
    despite being somewhat tricky with regard to endianess.

commit 4bb0164e6b2067376f085452a40137f13436384c
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Mon Apr 25 22:11:27 2022 +0200

    implement support for missing DW_LLE_* and DW_RLE_* values

commit e95904b99c87606eae1372ee4661e9db03833f08
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Tue Apr 26 08:35:16 2022 +0200

    treat DW_TAG_skeleton_unit like DW_TAG_compile_unit
    
    It's basically the same, except for being split-dwarf. Handling
    it is required e.g. for reading line info.

commit d19bbdf1200685ddbb6976cf915fba25f2097162
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Tue Apr 19 12:20:16 2022 +0200

    read dwarf5 DW_FORM_rnglistx and DW_FORM_loclistx
    
    The .debug_rnglists/.debug_loclists sections first have a list of offsets
    and then a list of the actual data that those offsets point to.

commit 383f36462fdc25a0e849391cf845e22703a95c08
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Mon Apr 25 22:11:27 2022 +0200

    avoid warning about missing DW_AT_*_base in skip_DIE()
    
    Similarly to setup_cu_bases(), DW_FORM_addrx etc. may depend
    on DW_AT_addr_base etc. that have not been read yet.

commit 61dfba4232d795c00603c74e6d0573f2d16641e2
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Tue Apr 19 11:14:52 2022 +0200

    read dwarf5 DW_FORM_addrx* and DW_FORM_strx* as generated by Clang14
    
    DW_FORM_addrx* are offsets into .debug_addr containing addresses.
    DW_FORM_strx* are offsets into .debug_str_offsets, which contain
    offsets into .debug_str. Support for these also requires reading
    DW_AT_addr_base and DW_AT_str_offsets_base before any other field
    in the abbrev table entry, as those may use this form.

commit 61ddbc1fc395c787192e569d8f2238f713bdfd8e
Author: Luboš Luňák <l.lunak at centrum.cz>
Date:   Tue Apr 19 10:58:44 2022 +0200

    read properly unit headers depending on dwarf5 unit_type
    
    There may be additional fields that need to be skipped over, otherwise
    further reading will interpret these incorrectly.

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https://bugs.launchpad.net/bugs/1995274

Title:
  Backport Clang 14 fix

Status in Valgrind:
  Fix Released
Status in valgrind package in Ubuntu:
  New
Status in valgrind package in Debian:
  New

Bug description:
  Please backport the following patch to all releases including Clang 14:
  https://bugs.kde.org/show_bug.cgi?id=452758

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